Key Features

Product Description

Master Bond EP21TDC-4 is a two component, very flexible epoxy for high performance bonding, sealing and coating. It has a non-critical one to four mix ratio by weight. This system has a relatively long open time of 90-120 minutes for a 100 gram mass. EP21TDC-4 has a room temperature cure that can be accelerated by adding heat. The optimum cure schedule is 12 hours at 75°F followed by 3-5 hours at 140-160°F. An unusual feature of this product is that straight heat curing results in a product that is slightly softer (50-60 Shore A), than the one with the optimum cure (75-85 Shore A). The cured system has a peel strength greater than 25-35 pli and an elongation of over 200%. EP21TDC-4 bonds well to a wide variety of metals, plastics and especially rubbers. In fact, it usually adheres well to rubbers such as neoprene, nitrile, SBR and occasionally EPDM, although surface treatment of the rubbers (especially EPDM) will allow for better adhesion. EP21TDC-4 has excellent electrical insulation properties along with good chemical resistance to oils and water. The epoxy has superior resistance to rigorous thermal cycling along with an outstanding ability to resist mechanical shock and vibration. The color of Part A is clear and Part B is amber-brown. It has an operating temperature range of -100°F to +250°F. EP21TDC-4 can be used in aerospace, electrical, OEM, electronic as well as repair and maintenance applications, where the special properties described above are desirable.

Product Advantages

Non-critical, one to four mix ratio, by weight, available in pre-measured kits

High peel strength

Withstands rigorous thermal cycling and shock

Bonds especially well to rubber including neoprene, nitrile, SBR and occasionally EPDM

Very good electrical insulator

Industrial Certifications

1,000 Hours at 85°C/85% RH

Packaging

Cans

Double Barrel Cartridge

FlexiPak®

Gun Applicator

Premixed & Frozen Syringe

Syringes

EP21TDC-4 is available is various sizes and units to accommodate customer's needs.